A bit of a long story, but my car came with the much-loved ZHP gear-knob, but among other bits in the boot was an illuminated one - off an F10 M5 I suspect complete with gaitor but no collar.
So based on this thread:- https://z4-forum.com/forum/viewtopic.php?f=9&t=66074
I thought I'd rather try to attach it to a "spare" collar before potentially wrecking my good gaitor! Seeing as I believe M's came pre-wired for illumination, and a bit of bling holds a certain appeal. :roll: